设计模式之简单工厂

工厂模式的优点在于让调用者与对象创建分离，调用者需要对象时，只需向工厂发起请求即可
简单工厂一般包括以下几个部分：
抽象接口
实现类
工厂类
通过以下代码可以看一下简单工厂的模型：
抽象接口

package com.yf.designpattern.simplefactory;public interface Car {public void drive();}

实现类

package com.yf.designpattern.simplefactory;public class BenzCar implements Car {@Overridepublic void drive() {System.out.println("This is a  Benz!!!");}}package com.yf.designpattern.simplefactory;public class BmwCar implements Car {@Overridepublic void drive() {System.out.println("This is a BMW!!!");}}

工厂类

package com.yf.designpattern.simplefactory;public class CarFactory {public Car driver(String str) {if(str.equalsIgnoreCase("Bmw")){return new BmwCar();}else if(str.equalsIgnoreCase("benz")){return new BenzCar();}else{return null;}}}

测试类

package com.yf.designpattern.simplefactory;public class Test {/** * @param args */public static void main(String[] args) {Car car=null;String str="Benz";CarFactory carFactory=new CarFactory();car=carFactory.driver(str);car.drive();}}